Re: [PATCH] HID: logitech-hidpp: support Color LED feature (8071).

[Pavel Machek]

Hi!

> > > The HID++ protocol allows to set multicolor (RGB) to a static color.
> > > Multiple of such LED zones per device are supported.
> > > This patch exports said LEDs so that they can be set from userspace.
> > > 
> > > Signed-off-by: Manuel Schönlaub <manuel.schoenlaub@xxxxxxxxx>
> > 
> > Please cc LEDs stuff to the LED lists.
> > 
> 
> Will do. Though it seems like first we should discuss whether the kernel
> in fact is the right place, no?

Well, on embedded systems keyboard backlight is handled in kernel.

> > > +	cdev = &mc_dev->led_cdev;
> > > +	cdev->name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
> > > +				    "%s:rgb:indicator-%d", hdev->uniq, zone);
> > 
> > So this is keyboard backlight? We should add the documentation at the
> > very least, so that other drivers use same name.
> 
> I do not own a Logitech keyboard, but some mice. There are RGB leds
> that you can normally control with Windows software.
> 
> I'd suppose (but could not verify) that supported keyboards by Logitech
> work with the same feature.

And I guess we should do the same for Logitech keyboards. Userspace
does not need to go to /sys/class/gpio... to control keyboard
backlight on Nokia cellphone, it should not need to talk USB directly
to control backlight on Logitech keyboards.

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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